body {
  font-family: Arial, sans-serif;
  text-align: center;
}
h1 {
  margin-bottom: 20px;
}
.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: 300px;
  margin: 0 auto;
}
.cell {
  width: 100px;
  height: 100px;
  border: 1px solid #ccc;
  font-size: 60px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}
.cell:hover {
  background-color: #eee;
}
.message {
  font-size: 24px;
  margin-top: 20px;
}
.reset {
  margin-top: 20px;
  font-size: 18px;
  padding: 10px 20px;
}